I know there are 2 major surplus dealers in Europe but Guy would be your guide in Europe. I would check ebay but do not know how to search Europe.
There is this listing on ebay here with a different part number. I suspect it is for the m101a1 and the length is the difference. Probably longer as it uses a taller tire and older axle. Cable being longer should not be an issue, you will just have more slack. You just can't use shorter obviously. If I were a betting man, that is the route I would take. I think the other cable is not out there to be found. Most places show out of stock.
PN: 15641505. YOU WILL RECEIVE WHAT IS SHOWN IN THE PICTURES.
www.ebay.com
When searching for the bearings and race, search the numbers separately. Some brands sell the bearing and race as separate items. Looks like there is 2 different sizes, probably inner and outer bearing / race. How are your seals? I would suggest changing those at the same time.
Look at post #8 on this thread for bearing information and a good source Etrailer or Croft among others
I have a few of the a2/a3 trailers and have found a lot of auto parts stores and Agri Supply carry the bearings and seals for these trailers. I also know that Titan/Dico makes the Backing plates and some brake parts. Bendix also some parts.....BUT ......... does anyone know if the brake...
www.steelsoldiers.com
Guy might be able to help and find the manufacture of the rubber stop but I don't recall that being available before. Maybe the manufacture would be willing to sell as has been done with the handles as that was also not a part readily found. He knows how to research the nsn and cage codes. A lot of that is still jibberish & confusing to me